High temperature PHA extraction using PHA-poor solvents

Polyhydroxyalkanoate (PHA) polyester is extracted from biomass by dissolving the PHA in a non-halogenated solvent which comprises a PHA-poor solvent that dissolves less than 1% of the PHA at temperatures less than the solvent boiling point, or a mixture of a PHA-poor solvent and a PHA-good solvent....

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Bibliographic Details
Main Authors PASTER; MARK D, KURDIKAR; DEVDATT L, STRAUSER; FRED E, SOLODAR; A. JOHN
Format Patent
LanguageEnglish
Published 11.07.2000
Edition7
Subjects
BEER
BIOCHEMISTRY
CHEMISTRY
COMPOSITIONS BASED THEREON
ENZYMOLOGY
FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
MICROBIOLOGY
MUTATION OR GENETIC ENGINEERING
ORGANIC MACROMOLECULAR COMPOUNDS
SPIRITS
THEIR PREPARATION OR CHEMICAL WORKING-UP
VINEGAR
WINE
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Summary:Polyhydroxyalkanoate (PHA) polyester is extracted from biomass by dissolving the PHA in a non-halogenated solvent which comprises a PHA-poor solvent that dissolves less than 1% of the PHA at temperatures less than the solvent boiling point, or a mixture of a PHA-poor solvent and a PHA-good solvent. Following extraction of PHA under pressure at a temperature above about 80 DEG C., typically above the boiling point of the PHA-poor solvent, PHA polymer is precipitated by cooling the PHA-enriched solvent mixture. Suitable PHA-poor solvents can include linear and branched R1-OH alcohols and R2-COOR3 esters where R1=C1-C4, R2=H, C1,C2, or C3, and R3=C1-C5.
Bibliography:Application Number: US19980060120